It depends on your system reqs, (and version of Vista). If u got 2+GB RAM, a decent (7600GT+) video card, and Vista Ultimate then yes install. Its what Im currently running and I have no probs with it @ all.
If you got Vista Home or Basic then no stick with XP and wait for a service pack to get released.
If you got Vista Home or Basic then no stick with XP and wait for a service pack to get released.